Skip to main content

microTone Module - Simple Analog Hardware Interface

microTone Module is analog interface to connect microcontrollers or digital logic systems with PCs. This interface use PC sound card’s audio output terminal to send commands to external hardware systems.

microTone Module is an open source project and all its software source codes and hardware designs are available to download at All the compiled software and source codes of this project are distributed under the terms of GNU Lesser General Public License. Hardware design and other documents are distributed under the terms of Creative Commons Attribution-ShareAlike 3.0 Unported License.

Software library of microTone Module is a Win32 DLL and it can use with any programming language which allows interface with dynamic link libraries (e.g: C++, C#, Python, Java, Delphi, Visual Basic, etc.) Some wrappers for this DLL are already implemented and available to download at microTone Module code repository. And also if you implement or improve microTone Module wrappers please share them with the community.

Documentation and other related information about microTone Module are available at microTone Module wiki at

microTone Module processing hardware unit is consist with well known CM8870 DTMF decoder and PIC16F628A microcontroller. Technically processing section of microTone Module can be implementing using most of the microcontrollers in the market and if you do so please share your designs, comments and firmware with the community.


Ben said…
Regarding using the audio jack for for communication.. any idea how those ir blasters work?

They have a 3.5mm jack on one side (the side you hook up to a pc/smartphone), and then on the other side there is a small plastic enclosure for the ir.

But to generate the 38khz freq for a typical remote control using an audio jack, the only approach I've seen is to have 2 leds back to back. Those commercial emitters seem awfully small to have 2 ir leds, so how do they do it?!
Hi Ben, most of the IR blasters use 2 IR emitter approach and you can make it smaller using SMD versions of IR emitters.

Popular posts from this blog

Enable WebRTC on QtWebEngine for Raspberry Pi 3

WebRTC is a web technology to enable peer to peer communication in real-time. It mainly uses to create video conferencing and chat applications using web browsers. In this post, we describe how to enable this technology in QtWebEngine on Raspberry Pi 3 platform.

QtWebEngine is an embedded browser component which comes with the Qt framework. This component is based on Google Chromium browser and it supports most of the Chromium features including WebRTC. In PC, WebRTC applications run smoothly on QtWebEngine component. But in Raspberry Pi platform situation is different and none of the WebRTC application is work with the QtWebEngine. The only thing which we can see is a black box in an HTML5 video tag area. At the time of writing this problem exists in Qt version 5.6, 5.7 and 5.8.

BMP180 based USB atmospheric pressure monitor

We initially developed this USB atmospheric pressure monitor to study some operating characteristics of Bosch BMP180 sensor. BMP180 is a low-cost sensor for measuring barometric pressure and temperature. According to the datasheet this sensor can use to measure pressure ranging between 300hPa to 1100hPa. This sensor is introduced a couple of years back but still, it is popular due to lower cost and simplicity of its interface.

We did this unit to test the BMP180 sensor more accurately and to study its behaviors. This unit is based on PIC18F2550 microcontroller and the main reason to select this MCU is because of its built-in USB 2.0 interface.

To display sensor calibration data and it’s readings we did small windows application. This application display and plot temperature and pressure readings captured from the BMP180 sensor.

This unit is programmed to work as a USB HID device and no special device driver is required to use this device. We test this unit in Windows 10 environment.

Programmable light controller

The main objective of this project is to design a maintenance free and low-cost light which automatically turns on and off at the predetermined time of the day.

To meet the above requirement I designed this controller using ATmega8 MCU and DS1307 RTC. The driver stage of this light controller is intended to work with commonly available 7W LED modules.

The core component of this programmable light is ATmega8 low power CMOS microcontroller. The main reason to select this microcontroller is it’s lower cost and higher availability. Except for the above two reasons this microcontroller also bundled with a rich set of peripherals which including 23 GPIOs, 3 independent timers, Two-wire serial interface, EEPROM, etc.

Apart from ATmega8 microcontroller, this system uses DS1307 real time clock to maintain system time. Like ATmega8, DS1307 is also a very popular RTC in the market.

This controller is designed to work with a 24V DC power supply. The main reason to select 24V is that most of the…